NAND Flash Drive

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NAND Flash Drive options allow configuring NAND Flash devices. Set the options manually or use the Configuration Wizard.

The following options can be set:

• NAND Flash Drive enables support for NAND Flash devices.

  #define NAND0_EN    1                    // 0=disable; 1=enable
  

• Page size specifies the NAND Flash read/write page size. The page size is defined as the sum of user plus spare area. Select the page size supported by the NAND Flash device. The following standard page sizes are available:
  
  

  Page Size	Config Wizard Option
  528	512 + 16 bytes
  2112	2048 + 64 bytes
  4224	4096 + 128 bytes
  8448	8192 + 256 bytes

  #define NAND0_PGSZ  2112
  

• Block Size is the size of the NAND Flash block. The value is specified as amount of flash pages. The following block sizes are available:
  
  

  Block Size	Config Wizard Option
  8	8 pages
  16	16 pages
  32	32 pages
  64	64 pages
  128	128 pages
  256	256 pages

  #define NAND0_PGCNT 16
  

• Device Size [blocks] specifies the number of blocks that are available in a NAND Flash device.

  #define NAND0_BLCNT 512
  

• Page Caching enables or disables the page data cache. This cache might increase the NAND Flash r/w speed a lot. When Page caching is enabled, the Flash File System keeps recently accessed NAND flash pages in cache memory for faster access.

  #define NAND0_CAPG  8
  

• Block Indexing enables or disables block indexing. When block indexing is enabled, the Flash File System keeps the Flash block index table in memory and does not scan the NAND flash blocks.

  #define NAND0_CABL  16
  

• Software ECC enables or disables using the Error Correction Algorithms from the RL-FlashFS library. This option should be enabled when the NAND Flash Driver does not implement this functionality in hardware.

  #define NAND0_SWECC 0                    // 0=disable; 1=enable
  

• File System Cache enables or disables the file data caching and specifies the Cache Buffer size. The data caching might increase the file r/w speed several times. When Caching is enabled, Flash File System uses Multiple Sector Read and Multiple Sector Write commands to control the USB Flash data read and write. Cache buffer size is specified in KBytes. Turn off the data cache if the application is low on memory and the file read/write speed is not important.

  #define NAND0_CASZ  8
  

• Relocate Cache Buffer allows assigning a specific base address to the RAM buffer. Set the option to 1 to enable it. 0 disables the option. When disabled, the linker assigns the implicit address of the RAM buffer.

  #define NAND0_RELOC 1                    // 0=disable; 1=enable
  

• Base address specifies the base address of the RAM buffers. This option is used when the Relocate Device Buffer is enabled.

  #define NAND0_CADR  0x80000000
  

• FAT Journal protects the file system from a potential damage during power failure and keeps the system in a consistent state. This option does not protect files that are written during power failure.

  #define NAND0_FSJ   1                    // 0=disable; 1=enable
  

• Default Drive [N:] enables the NAND Flash Drive as a default system drive.

  #define NAND0_DEF   0                    // 0=disable; 1=enable